clone的小例子

最新推荐文章于 2020-12-15 14:02:56 发布

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最新推荐文章于 2020-12-15 14:02:56 发布

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分类专栏： Java基础编程文章标签： string object c null class

本文链接：https://blog.youkuaiyun.com/eric_sunah/article/details/6892437

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本文探讨了Java中对象克隆的实现机制，通过创建简单克隆类、复杂克隆类以及深克隆类来展示不同场景下克隆操作的实现与效果，并通过实例演示了如何在公司和部门类中进行克隆操作，展示了浅克隆和深克隆的区别。

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package com.eric.clone;

public class CloneTest {
public static void main(String[] args) {
  SimpleClone sc = new SimpleClone("Eric");
  SimpleClone sc2 = (SimpleClone) sc.clone();
  System.out.println("sc2.getName:" + sc2.getName());
  System.out.println("sc2:" + sc2 + " \n sc:" + sc);

  Department d1 = new Department("IT");
  Company c1 = new Company(d1);
  Company c2 = (Company) c1.clone();
  System.out.println("c1:" + c1 + "\nc2:" + c2 + "\n");
  System.out.println("c1==c2:" + (c1 == c2));
  System.out.println("c1.department==c2.department:" + (c1.getDepartment() == c2.getDepartment()) + "\n\n");

  Department d2 = new Department("IT");
  Company2 c21 = new Company2(d2);
  Company2 c22 = (Company2) c21.clone();
  System.out.println("c21:" + c21 + "\nc22:" + c22 + "\n");
  System.out.println("c21==c22:" + (c21 == c22));
  System.out.println("c21.department==c22.department:" + (c21.getDepartment() == c22.getDepartment()));
}
}

class SimpleClone implements Cloneable {
private String name;

public SimpleClone(String name) {
  this.name = name;
}

public String getName() {
  return name;
}

public void setName(String name) {
  this.name = name;
}

public Object clone() {
  try {
   return super.clone();
  } catch (CloneNotSupportedException e) {
   e.printStackTrace();
   return null;
  }
}
}

// complex clone but not deep clone
class Company implements Cloneable {
private Department department;

public Department getDepartment() {
  return department;
}

public void setDepartment(Department department) {
  this.department = department;
}

public Company(Department department) {
  super();
  this.department = department;
}

public Object clone() {
  try {
   return super.clone();
  } catch (CloneNotSupportedException e) {
   e.printStackTrace();
   return null;
  }
}

}

// complex clone and deep clone
class Company2 implements Cloneable {
private Department department;

public Department getDepartment() {
  return department;
}

public void setDepartment(Department department) {
  this.department = department;
}

public Company2(Department department) {
  super();
  this.department = department;
}

public Object clone() {
  try {
   Company2 company2 = (Company2) super.clone();
   company2.department = (Department) this.department.clone();
   return company2;
  } catch (CloneNotSupportedException e) {
   e.printStackTrace();
   return null;
  }
}

}

class Department implements Cloneable {
private String name;

public Department(String name) {
  super();
  this.name = name;
}

public String getName() {
  return name;
}

public void setName(String name) {
  this.name = name;
}

public Object clone() {
  try {
   return super.clone();
  } catch (CloneNotSupportedException e) {
   e.printStackTrace();
   return null;
  }
}

}